Well, if the recipe had been made “Duchess of Cornwall's Roast Chicken” or “Royal Roast Chicken”, I might have considered it a plug. However, "Tom's Mum's Roast Chicken" sounds innocent enough to me. Maybe Camilla did make great Roast Chicken, so why not give her a credit for the recipe?

It could be that the family refused to make any annoucement exccept in the birth notices as they recognise that they aren't actually royals but connected by default.

I am pleased that Camilla's children are deliberately taking a low profile and not announcing all sorts of things to the press meaning that they aren't cashing in on their connections but are really trying to keep themselves out of the limelight.

I see nothing wrong with there not being an annoucement about this birth and don't see that it is any of our business anyway.

Well it is important in the sense that Tom is a known media personality and author. He is the son of the Duchess of Cornwall, so I think the birth announcement in the Times is appropriate.

He and his sister, are not members of the British Royal Family and I think some people think that they should rate the same type of media fanfare and prestige as some of the junior members of the BRF and IMO this is not the case. They are private citizens whose mother married the heir to the throne. They are not of royal birth.

It was announced in Hello!, DailyMail and other tabloids when Sara and Laura fell pregnant both times.
When Lola, Eliza (Laura announced it the News Of The World herself when she fell pregant), Gus & Louis were born most major tabloids covered it.

I'd say at least some of the british population would like to know, Tom is well known for his cooking appearances, he's written two books. Sara is a fashion features editor in Harpers Bazaar.

Plus he's the DOC son, people who follow the royal family want to know, they aren't directly connected but they are connected in a way.
Like Jasmin Grimaldi, daughter of the Prince of Monaco, not in line for succesion but people want to know about her.